About 2" diameter
Selenite is powerful enough to clear negative energies and reprogram your crystals. You never need to recharge it. It can help in expanding your awareness and contacting your spiritual guides and Angels. Rubbing the stone may help you enter in the realm of dreams, intuition and in a meditative state. Selenite can be placed on the third eye chakra to increase telepathic abilities. The insight it provides is valuable in any healing treatment.
(Do not immerse in water because it can eventually dissolve the mineral)